High-nickel austenite nodular cast iron production process adopting wire-feeding spheroidizing

A nodular cast iron, production process technology, applied in the field of high-nickel austenitic nodular cast iron production process, to achieve the effect of simple process operation, improved working environment and working conditions, and easy dust

Active Publication Date: 2016-02-10
TIANJIN DA SHIANG PRECISION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to overcome the above-mentioned shortcomings existing in existing products, and provide a kind of high-nickel austenitic nodular cast iron production process that adopts wire-feeding spheroidization treatment, which can avoid the metallographic problem of castings and make the quality of castings stable. Low production cost and low defect rate; at the same time, it can improve labor intensity and working conditions, and improve work efficiency; the dust generated during the spheroidization process is easy to control and is more environmentally friendly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Production of high-nickel austenitic nodular cast iron by smelting Mg wire-feeding spheroidization method.

[0011] The process steps are as follows:

[0012] 1. Batching (batching according to weight percentage): pig iron=6%, steel scrap=7%, returned material=78%, nickel plate=7%, ferrosilicon=1%, ferrochrome=1%.

[0013] 2. Smelting and composition adjustment: The smelting equipment uses an intermediate frequency induction furnace, puts pig iron, scrap steel, returned materials, and nickel plates into the intermediate frequency induction furnace in sequence according to the proportions mentioned in (1), and starts to send power to raise the temperature until the materials in the furnace are completely melted Afterwards, continue to heat up to 1500 degrees, pour the spectroscopic test piece for composition analysis; calculate the need to add alloy according to the composition result of the spectroscopic analysis, add 1% nickel plate in this embodiment, add the alloy in...

Embodiment 2

[0025] The sandwich spheroidization method (also known as the flushing method) is used to produce high-nickel austenitic nodular cast iron.

[0026] The process steps are as follows:

[0027] 1. Batching (batching according to weight percentage): pig iron=10%, scrap steel=10%, returned material=64%, nickel plate=14%, ferrosilicon=1%, ferrochrome=1%;

[0028] 2. Smelting and composition adjustment: The smelting equipment uses an intermediate frequency induction furnace, puts pig iron, scrap steel, returned materials, and nickel plates into the intermediate frequency induction furnace in sequence according to the proportions mentioned in (1), and starts to send power to raise the temperature until the materials in the furnace are completely melted After opening, continue to heat up to 1500 degrees, and pour the spectroscopic test piece to carry out component analysis; calculate the need to add alloy according to the component results of spectroscopic analysis, the alloy added in...

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Abstract

The invention provides a high-nickel austenite nodular cast iron production process adopting wire-feeding spheroidizing. The high-nickel austenite nodular cast iron production process adopting wire-feeding spheroidizing comprises the steps of material preparation, smelting and ingredient adjustment, spheroidizing, casting, box disassembling and after-treatment and thermal treatment. The production process is characterized in that the spheroidizing is wire-feeding spheroidizing; the bad metallographic phase problem of castings can be avoided, the castings are made to be stable in quality, the production cost is low, and the reject ratio is low; meanwhile, labor intensity can be relieved, working conditions can be improved, and working efficiency is improved; dust generated in the spheroidizing procedure is easy to control, and the process is more environmentally friendly.

Description

technical field [0001] The invention relates to a production process of high-nickel austenitic nodular cast iron adopting wire-feeding spheroidization treatment. Background technique [0002] The turbocharger housing and the exhaust manifold are important parts of the engine with the turbocharger function. Both the turbocharger and the exhaust manifold work at high temperatures, so the high temperature resistance of the material is required to be at 850°C Above, most of the high-nickel austenitic ductile iron is used at present. In the existing production process of high-nickel austenitic nodular cast iron, the spheroidizing process adopts the sandwich spheroidizing method, and the spheroidizing agent adopts silicon-magnesium spheroidizing agent or nickel-magnesium spheroidizing agent. When silicon magnesium (Si: 40 to 50%, Mg: 6 to 8%) spheroidization process is used, the proportion of nodulizer added is relatively high (1.6 to 1.8%), and the amount of silicon increased du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/10C21C1/10
Inventor 陈友三陈常彬林政德郭志雄谢成兴温学文
Owner TIANJIN DA SHIANG PRECISION IND CO LTD
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